Technique Supporting:1. To use this product to enlarge your signal, the outdoor signal shall be as good as possible. The product will not work well if your outdoor signal is not good or bad.2. If still no signal receipt after activated repeater, please check if outdoor antenna point to signal tower or elsewhere have strong signal and check if strength achieve -50DBM.3. If you can’t call out, please adjust the direction of outdoor antenna.4. If strength is not steady, please check if outdoor and indoor antennas are too close. Please ensure the outdoor and indoor antennas have distance of 10 meters at least, with a wall between them and not in a same horizontal line.